v0.8.3

OMEinsum v0.8.3

Diff since v0.8.2

Merged pull requests:

• Update documentation and README (#172) (@GiggleLiu)

Closed issues:

• inplace interface (#75)
• Documentation is outdated (#142)
• [Feature request] Inplace version einsum function (#148)
• Optimized einsum notation (#168)